Heat 1
What happens to the particles in a solid when heated?
They vibrate faster but remain in place.
What are the three methods of heat transfer?
Conduction, Convection, Radiation
What type of wave is light?
Electromagnetic wave
What is regular reflection?
Reflection from a smooth surface that forms a clear image.
What type of wave is a sound wave?
Longitudinal
Through which state of matter does sound travel fastest?
Solid
Which state of matter has particles that move freely in all directions?
Gas
Which type of heat transfer occurs in solids through particle vibration?
Conduction
What is the speed of light?
300 000 km per s
What is diffuse reflection?
Scattered reflection from a rough surface.
What is the unit of frequency?
Hertz (Hz)
What is an echo?
A reflected sound wave
What causes a substance to expand when heated?
Particles move faster and spread apart.
What surfaces absorb the most radiated heat?
Dark, rough surfaces
What type of energy from the Sun includes light, UV rays, and radio waves?
Electromagnetic radiation
What is the law of reflection?
Angle of incidence = angle of reflection.
What determines the pitch of a sound?
The frequency of the wave
What kind of material absorbs sound best?
Soft materials (e.g., fabric, carpet)
What is the term for the change of a substance from solid to liquid?
Melting
Why can radiation occur in space?
Because it doesn't need particles to transfer heat.
What does it mean if an object is luminous?
It produces its own light.
What is the imaginary line drawn perpendicular to a mirror’s surface called?
Normal
What do we call the distance between compressions in a sound wave?
Wavelength
What is reverberation?
The persistence of sound after the source has stopped due to reflections.
At what temperature (°C) do particles theoretically stop moving?
-273°C (Absolute zero)
What type of heat transfer is responsible for sea breezes?
Convection
Which color of light has the shortest wavelength?Violet or Red
Violet
What is lateral inversion in a plane mirror? Think about what happens to position of objects when you look in the mirror.
The reversal of left and right in the reflected image.
What is the Doppler Effect? Think about what happens when a car speeds past you.
A change in frequency and pitch when the sound source moves relative to the observer.
What is sonar used for?
Measuring depth using reflected sound waves